Study of shear behavior of grouted vertical joints between precast concrete wall panels under direct shear loading
About: This article is published in Structural Concrete.The article was published on 2019-04-01. It has received 21 citations till now. The article focuses on the topics: Direct shear test & Precast concrete.
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TL;DR: In this paper, the performance of two different types of precast reinforced concrete structural wall systems viz. precast wall-column system and precast double leaf system were evaluated under displacement controlled cyclic mode and hysteretic characteristics were assessed in detail in terms of damage pattern and various seismic characteristics.
14 citations
TL;DR: Tall buildings are the need of the hour for affordable housing projects in India and the strength and stiffness are generally provided by the wall system, which comprises shear walls, and their behaviour under various loading conditions are discussed.
Abstract: Industrialized building system (IBS) is the term used to represent the concept of prefabrication, and it has been widely used worldwide. In the last few decades, all the reinforced concrete structures in India were constructed adopting the cast-in-situ construction. Many problems were encountered during the cast-in-situ construction, such as incompletion of work at specified time due to weather conditions, design methods, lack of workmanship, congestion due to traffic, and curing time. These issues can be highly reduced by choosing precast construction as each structural element is manufactured in the factory and only erection is done at the site. This process has a considerable reduction in construction time and ensures the quality of the elements. Tall buildings are the need of the hour for affordable housing projects in India. In tall buildings, the strength and stiffness are generally provided by the wall system, which comprises shear walls. The shear wall system should be effective with wind loads and earthquake loads, if not it will lead to catastrophic failure. Connections play an important role in the lateral load resistance of the precast wall system because it is the weakest link in the precast wall system. The biggest challenge is the behaviour and possible failure of the connections due to severe lateral loads against earthquake or wind excitations. A brief review of various horizontal and vertical connections of shear walls and their behaviour under various loading conditions are discussed.
7 citations
TL;DR: In this article , eight groups of Z-joint specimens were designed for conducting direct shear tests on steel keyed joints and the shape, size, number and joint type of steel keys were taken as experimental parameters, and the cracking load, ultimate load, residual load, and relationship between vertical loading force and vertical relative displacement of specimens were investigated.
Abstract: Eight groups of “Z” joint specimens were designed for conducting direct shear tests on steel keyed joints. The shape, size, number and joint type of steel keys were taken as experimental parameters, and the cracking load, ultimate load, residual load, and the relationship between vertical loading force and vertical relative displacement of specimens were investigated. The results reveal that the joints relied on the mechanical occlusion between the steel keys and concrete to transmit the shear forces, the load–displacement curve of the joints had a long development course, and the joints could bear large relative displacement. The bearing capacity of steel shear keyed joints increased with the increase in diameter and material strength of the tenon. The ultimate bearing capacity of the epoxied joints with 1 and 2 steel keys were respectively 151.39%, and 69.68% higher than dry joints. Meanwhile, the epoxied joints were found to become brittle and fail in more sudden manner. After direct shear failure, the shear resistance of epoxied joints was completely provided by the steel shear key. The elastic stiffness and bearing capacity of the epoxied joints was not controlled by the number of the steel shear keys, while the dry joints were sensitive with the number of keys. By adding 1 or 2 steel shear keys to a flat joint, the ultimate bearing capacity could be increased by 3.81 and 6.06 times for dry joints, and 43% and 33% for epoxied joints, respectively.
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01 Aug 1976
169 citations
TL;DR: P recast concrete shear wall panels are used extensively in high rise construction as mentioned in this paper, mainly due to the high quality control that is achieved at the manufacturing plant, and the ease and speed of panel assembly at the construction site.
Abstract: P recast concrete shear wall panels are used extensively in high rise construction. Their attractiveness and economy are mainly due to the high quality control that is achieved at the manufacturing plant, and the ease and speed of panel assembly at the construction site. One of the main concerns in precast concrete construction is the method by which the panels are connected. Connections must provide adequate strength, ductility and continuity in order to insure the integrity of the structure under various loading conditions. The typical connections currently used for elevator shaft shear wall panels
50 citations
TL;DR: In this paper, a new and construction-friendly shear connection for the assembly of precast reinforced concrete shear wall elements is presented, where the planes of the U-bar loops are parallel to the plane of the wall elements.
Abstract: This paper presents a new and construction-friendly shear connection for the assembly of precast reinforced concrete shear wall elements. In the proposed design, the precast elements have indented interfaces and are connected by a narrow zone grouted with mortar and reinforced with overlapping U-bar loops. Contrary to conventional shear connections, the planes of the U-bar loops are here parallel to the plane of the wall elements. This feature enables a construction-friendly installation of the elements without the risk of rebars clashing. The core of mortar inside each U-bar loop is reinforced with a transverse double T-headed bar to ensure transfer of tension between the overlapping U-bars. Push-off tests show that a significantly ductile load–displacement response can be obtained by the new solution as compared to the performance of the conventional keyed shear connection design. The influence of the interface indentation geometry was investigated experimentally and the failure modes in the push-off tests were identified by use of digital image correlation (DIC). For strength prediction, rigid plastic upper-bound models have been developed with inspiration from the observed failure mechanisms. Satisfactory agreement between tests and calculations has been obtained.
45 citations
"Study of shear behavior of grouted ..." refers methods in this paper
...To eliminate the clashing of joint reinforcement, construction-friendly reinforcement configuration was also studied.(13,14) Also, the behavior of T-connection (connection FIGURE 1 Schematic sketches of test setups used in previous studies TABLE 1 Expressions for shear strength of vertical joint...
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TL;DR: In this article, the authors proposed two formulae for the calculation of bearing capacity of shear-key joints and verified them on the basis of experimental data obtained from tests by Hansen and Oleson, Pommeret and the author.
33 citations
31 citations
"Study of shear behavior of grouted ..." refers methods in this paper
...The expression proposed by Chakrabarti et al.(10) and later adopted by Abdul-Wahab and Sarsam(17) is based on Mohr–Coulomb failure criterion....
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...The expression proposed by Chakrabarti et al.10 and later adopted by Abdul-Wahab and Sarsam17 is based on Mohr–Coulomb failure criterion....
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...The ultimate capacity predicted by Cholewicki,4 Chakrabarti et al.,10 Abdul-Wahab and Sarsam,17 and Chatveera and Nimityongskul11 are in the range of 0.43–1.12, 0.88–1.60, 0.48–1.0, and 0.79–1.77 times the experimental values, respectively....
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...The expressions proposed by Cholewicki,4 Chakrabarti et al.,10 Abdul-Wahab and Sarsam,17 and Chatveera and Nimityongskul11 were considered to compare the values of ultimate capacity....
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